Antithrombin III was found in Davis's Lab & Diagnostic Tests which delivers information on how the test works, how to accurately interpret results, and how to provide the best care to your patients before, during, and after a test.

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Davis's Lab and Diagnostic Tests

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General

Synonym/Acronym:
Heparin cofactor assay, AT-III.

Common Use:
To assist in diagnosing heparin resistance or disorders resulting from a hypercoagulable state such as thrombus.

Specimen:
Plasma (1 mL) collected in a completely filled blue-top (3.2% sodium citrate) tube. If the patient’s hematocrit exceeds 55%, the volume of citrate in the collection tube must be adjusted.

Normal Findings:
(Method: Chromogenic Immunoturbidimetric)

AgeConventional Units
1–4 days39–87%
5–29 days41–93%
1–3 mo48–108%
3–6 mo73–121%
6–12 mo84–124%
1–5 yr82–139%
6–17 yr90–131%
18 yr-older adult80–120%

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